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The Bard 905-0333 expansion valve assembly is an OEM refrigerant metering component used in Bard wall-mounted air conditioner and heat pump systems to control refrigerant flow into the evaporator coil for stable cooling performance. A properly functioning expansion valve helps maintain correct superheat, supports efficient heat transfer, and can resolve symptoms like poor cooling, coil icing, or erratic suction pressure when the rest of the refrigeration circuit is in good condition. Because this is a refrigerant circuit repair, confirm the part number match to your unit model and serial and have installation performed by a qualified HVAC technician following proper evacuation and recharge procedures.